It seems that I've been misunderstood. The thing is not only with linux kernel. The trouble is with "linux kernel 2.6.35(and newer)"+"nvidia driver"+"8600m GT".
Today is the release date of ubuntu 11.04, when I'll get home I'll upgrade and try to submit a "good report" here.
Thank you for your answer.

I had the same problem with ubuntu 10.10 after updating Linux Kernel and Geforce Gtx 460.
Today I did an Ubuntu 11.04 clean install, so I downloaded and installed 270.41.06 nvidia driver and again a i get blank screen after rebooting SO.

I've only ever seen this bug reported on Ubuntu, so my guess is that one of Ubuntu's kernel customizations is responsible. A good place to start would be to see if the problem goes away with a vanilla kernel, and then start adding Ubuntu's patches to see which one is responsible.